| 4. || <math>s\!</math> is a ''subclause'' of <math>\mathfrak{L}</math> if and only if
+
|-
+
| || <math>s\!</math> is a sentence of <math>\mathfrak{L}</math> and <math>s\!</math> ends with a <math>^{\backprime\backprime} \, \operatorname{)} \, ^{\prime\prime}.</math>
|}
|}
<pre>
<pre>
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4. z is a "subclause" of !L! if and only if
−
−
z is a sentence of !L! and z ends with a ")-".
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5. z is the "subcatenation" of z_1 by z_2 if and only if
5. z is the "subcatenation" of z_1 by z_2 if and only if